Age of -360-m reef terrace, Hawaii, and the rate of late Pleistocene subsidence of the island
Barney J. Szabo, James G. Moore
1986, Geology (14) 967-968
Observations from a manned submersible vehicle indicate that the −360-m reef terrace northwest of the island of Hawaii is a drowned coral reef. The preferred uranium-series age of coralline algae collected from the reef face is 120 ± 5 ka. This age agrees with the notion that the reef was...
The Munson-Nygren slide: A major lower-slope slide off Georges Bank
Dennis W. O’Leary
1986, Marine Geology (72) 101-114
The Munson-Nygren slide is a large compound slide located between Munson and Nygren Canyons below 1900 m depth on the Continental Slope off Georges Bank. Its structural and morphological features are recognized in high-resolution seismic-reflection profiles. The slide comprises an axial trough which has a relief as great as 325...
Morphological variation and zoogeography of racers (Coluber constrictor) in the central Rocky Mountains
Paul Stephen Corn, R. Bruce Bury
1986, Herpetologica (42) 258-264
We examined 63 specimens of Coluber constrictor from Colorado and Utah using eight external morphological characters that have been used to distinguish C. c. mormon from C. c. flaviventris. We grouped the snakes into three Operational Taxonomic Units (OTU's) in a transect across the Rocky Mountains: the eastern Front...
Klamath-Blue Mountain lineament, Oregon
Robin P. Riddihough, Carol A. Finn, Richard Couch
1986, Geology (14) 528-531
Regional gravity data clearly show a zone of southwest-northeast lineations across Oregon that defines a major crustal lineament. Its existence is supported by geologic and geophysical data. Its correlation with the northwestern boundaries of the Klamath and Blue Mountain provinces suggests that these are continuous beneath the Cascade volcanic arc....
Shrinkage and growth compensation in common sunflowers: refining estimates of damage
James A. Sedgwick, John L. Oldemeye, Elizabeth L. Swenson
1986, Journal of Wildlife Management (50) 513-520
Shrinkage and growth compensation of artificially damaged common sunflowers (Helianthus annuus) were studied in central North Dakota during 1981-1982 in an effort to increase accuracy of estimates of blackbird damage to sunflowers. In both years, as plants matured damaged areas on seedheads shrank at a greater rate than the...
Implications of recent advances in instrumentation for strong-motion studies
Roger D. Borcherdt
1986, Conference Paper, Proceedings of the 17th joint panel meeting of the U.S.-Japan Cooperative Program in Wind and seismic effects
No abstract available....
Transient electromagnetic soundings in the Michigan Basin for ground water evaluation
D.V. Fitterman
1986, Conference Paper, Proceedings of the Surface and Borehole Geophysical Methods and Ground Water Instrumentation Conference and Exposition
No abstract available....
An inverse method using toroidal mode data
C. Willis
1986, Inverse Problems (2) 111-130
The author presents a numerical method for calculating the density and S-wave velocity in the upper mantle of a spherically symmetric, non-rotating Earth which consists of a perfect elastic, isotropic material. The data comes from the periods of the toroidal oscillations. She tests the method...
Marine cobalt resources
F.T. Manheim
1986, Science (232) 600-608
Ferromanganese oxides in the open oceans are more enriched in cobalt than any other widely distributed sediments or rocks. Concentrations of cobalt exceed 1 percent in ferromanganese crusts on seamounts, ocean ridges, and other raised areas of the ocean. The cobalt-rich crusts may be the slowest growing of any earth...
Unsteady, nonuniform landslide motion: 2. Linearized theory and the kinematics of transient response
Richard M. Iverson
1986, Journal of Geology (94) 349-364
Unsteady, nonuniform landslide motion is caused by temporal and spatial variations in driving and resisting forces. Common sources of these variations include stream undercutting of landslide toes, episodic headscarp slumping, and ground-water potentiometric fluctuations. A linear theory for the kinematics of unsteady,...
Habitat use and terrestrial activity by red tree voles (Arborimus longicaudus) in Oregon
Paul Stephen Corn, R. Bruce Bury
1986, Journal of Mammalogy (67) 404-406
Several species of vertebrates may find optimal habitat for breeding, nesting, or foraging in old-growth (>200 years old) confierous forests in the Pacific Northwest. Old-growth forests are economically valuable, however, and most unprotected stands will be cut within 40 years (Franklin et al., 1981). Meslow et al. (1981)...
Remote sensing and mapping of the vegetation and land use of Senegal
G. Gray Tappan
1986, Conference Paper, Proceedings of the 20th International Symposium on Remote Sensing of Environment
No abstract available....
Biomonitors of stream quality on agricultural areas: fish versus invertebrates
Hilary E. Berkman, Charles F. Rabeni, Terence P. Boyle
1986, Environmental Management (10) 413-419
Although the utility of using either fish or benthic invertebrates as biomonitors of stream quality has been clearly shown, there is little comparative information on the usefulness of the groups in any particular situation. We compared fish to invertebrate assemblages in their ability to reflect habitat quality of sediment-impacted streams...
Does pH affect fish species richness when lake area is considered?
P.J. Rago, J.G. Wiener
1986, Transactions of the American Fisheries Society (115) 438-447
Numerous surveys have shown that fish species richness (number of species) is positively correlated with lake pH. However, species richness of fish communities is also correlated with lake size, and low‐pH lakes are often small. Thus, conclusions drawn from examination of fish community structure relative to spatial...
Plasma corticosteroid stress response of fourteen species of warmwater fish to transportation
K. B. Davis, N. C. Parker
1986, Transactions of the American Fisheries Society (115) 495-499
Plasma corticosteroid concentrations were measured in 14 species of fish immediately after they were electrofished from reservoirs on the Alabama River and after they had been transported for 2 h. There was no corticosteroid response in spotted gars Lepisosteus oculatus. Bowfins Amia calva, longnose gars Lepisosteus osseus, and freshwater drums...
Infectious pancreatic necrosis virus: protocol for a standard challenge to brook trout
P. E. McAllister, W. J. Owens
1986, Transactions of the American Fisheries Society (115) 466-470
A protocol for experimental challenge with infectious pancreatic necrosis (IPN) virus was defined with brook trout Salvelinus fontinalis as the model species. Fish were exposed by immersion for 5 h in water containing IPN virus at a concentration of 105 plaque‐forming units per milliliter. We propose the protocol as a standard...
An instrument system for monitoring and sampling suspended sediment in the benthic boundary layer
R.W. Sternberg, R.V. Johnson II, D.A. Cacchione, D.E. Drake
1986, Marine Geology (71) 187-199
An instrument system has been constructed that can monitor and sample suspended sediment distributions in the benthic boundary layer. It consists of miniature nephelometers and suspended sediment samplers placed within one meter of the seabed. The system is capable of continuously monitoring suspended sediment profiles at eight levels between 14...
Determination of the components of stormflow using water chemistry and environmental isotopes, Mattole River basin, California
V. C. Kennedy, Cynthia R. Adams, Gary W. Zellweger, Theodore A. Wyerman, R.J. Avanzino
1986, Journal of Hydrology (84) 107-140
The chemical and isotopic composition of rainfall and stream water was monitored during a storm in the Mattole River basin of northwestern California. About 250 mm of rain fell during 6 days (∼80% within a 42 h period) in late January, 1972, following 24 days of little or no precipitation....
Decrease in deformation rate observed by two-color laser ranging in Long Valley caldera
Mark F. Linker, J. O. Langbein, Art McGarr
1986, Science (232) 213-216
After the January 1983 earthquake swarm, the last period of notable seismicity, the rapid rate of deformation of the south moat and resurgent dome of the Long Valley caldera diminished. Frequently repeated two-color laser ranging measurements made within a geodetic network in the caldera during the interval June 1983 to...
The geochemical behavior of aluminum in acidified surface waters
D. Kirk Nordstrom, J.W. Ball
1986, Science (232) 54-56
Speciation calculations for aluminum, in water samples taken from a drainage basin containing acid mine waters, demonstrate a distinct transition from conservative behavior for pH. below 4.6 to nonconservative behavior for pH. above 4.9. This transition corresponds to the pK for the first hydrolysis constant of the aqueous aluminum ion...
Evaluation of coded wire tags for marking lake trout
Joseph H. Elrod, Clifford P. Schneider
1986, North American Journal of Fisheries Management (6) 264-271
Among hatchery-reared lake trout (Salvelinus namaycush) of the 1979-1982 year classes stocked in New York waters of Lake Ontario, more than 3 million fish were marked with a coded wire tag (CWT) plus an adipose fin clip, and 1.5 million with only conventional fin clips. Altogether, 7,640 tags were recovered...
Vigilance patterns of Bald Eagles feeding in groups
Susan K. Knight, Richard L. Knight
1986, The Auk (103) 263-272
Patterns of vigilant behavior of wintering Bald Eagles (Haliaeetus leucocephalus) feeding on spawned salmon were examined in 1983-1984 on the Nooksack River in north-western Washington. Vigilance in feeding birds has, in general, been attributed to predator detection; however, we proposed an additional function of vigilance in socially feeding birds...
Cavity-nesting birds and the cavity-tree resource in plains cottonwood bottomlands
James A. Sedgwick, Fritz L. Knopf
1986, Journal of Wildlife Management (50) 247-252
Densities of, and potential nesting substrates for, cavity-nesting birds were examined in a mature plains cottonwood (Populus sargentii) community in northeastern Colorado. Although snag (dead tree) densities were low (0.66/ha), the cavity-nesting guild included 7 species with densities ≤ 463 birds/100 ha. This finding suggests that cavity nesters...
Comparison of four artificial substrates and the Ponar grab for benthic invertebrate collection
Keith V. Slack, Rodger F. Ferreira, Robert C. Averett
1986, Journal of the American Water Resources Association (22) 237-248
Four different bottom‐placed artificial substrates were compared with the Ponar grab for collecting benthic invertebrates. Artificial substrate samples of organisms were larger and more diverse than those of the grab. Barbeque Basket samplers caught the most taxa and individuals and Beak Trays caught the least. Chironomids and crustaceans were dominant...
Parasitization of meadow voles, Microtus pennsylvanicus (ORD), by American dog ticks, Dermacentor variabilis (Say), and adult tick movement during high host density
J. F. Carroll, J.D. Nichols
1986, Journal of Entomological Science (21) 102-113
The numbers of host-seeking adult American dog ticks, Dermacentor variabilis (Say), in a sweet gum field in Maryland reflected changes in the population density of a host species, the meadow vole, Microtus pennsylvanicus (Ord), which within 1.5 yr fell from an estimated 157 to 8 voles on a 0.8 ha grid. During high vole...
